Extrusion system for producing a plastic plate with anchor knobs

ABSTRACT

The present invention relates to a device and a method for continuously producing a plastic plate and/or film comprising lugs or anchors that are formed therewith in one piece, wherein the molten plastic is guided in the form of a flat web through a gap between a roll and a circulating device, wherein said circulating device comprises circulating shaping strips having recesses for forming the anchors, and the shaping strips, when passing from a straight section into a curved section of the circulating device, open thereby enabling the formed anchors to be released or ejected without force. The device of the present invention and the method of the present invention enable a continuous production of anchor plates comprising, in particular, non-positive and complicated anchor shapes that can be realized quickly and with a few working steps.

The present invention relates to a device and a method for continuouslyproducing a plastic plate and/or sheet comprising lugs or anchors thatare formed therewith integrally or in one piece, wherein the moltenplastic is guided in the form of a flat web through a gap between a rolland a circulating device, wherein said circulating device comprisescirculating shaping strips having recesses for forming the anchors, andwherein the shaping strips, when passing from a straight section into acurved section of the circulating device, open so that the formedanchors are released or ejected without force.

Plastic plates comprising lugs or anchors and produced in accordancewith the present invention are used for lining, covering or encasingbuildings or components. Such buildings or components normally consistsof concrete, mortar, soil or other pourable materials or viscousmaterials.

On one or two sides, the plastic plate, sheet or film comprises lugs oranchors by means of which it is connected with the building orcomponent, usually during production thereof. The lugs or anchors servefor a mechanical attachment to the component and, for this purpose, havespecific geometrical shapes, preferably with undercuts, depending on thefield of application and the material used.

Plastic plates of this kind are used, in particular, as a chemicallyresistant, fluid and/or gas tight protection of constructions. Theyguarantee tightness to water, waste water, all kinds of chemicals,acids, lyes or alkaline solutions, as well as gases and other media.

Plastic plates of this kind are used, i.a., in buildings and components,such as tubes, pipelines, tunnels, channels, reservoirs, containers,chimneys, masonry dams, roadways, bridges, foundation plates in cellarsas well as external fronts or facades.

Such plates are normally made of thermoplastic materials being highlyresistant to temperature and chemicals, such as, e.g., polyethylene,polypropylene, polyvinylchloride (PVC), polyvinylidenefluoride (PVDF),ethylene tetrafluoroethylene (ETFE) as well as special types of saidmaterials that are normally processed in a continuous process.

DE-U-296 15 818 describes a device for producing a protective platecomprising fastening knobs, wherein the device comprises a means forcold shaping the fastening knobs; for mutually pressing the fasteningknobs that are arranged in rows, two elongate profiles are providedwhose stamping edges are entirely or partly rounded and/or compriseoblique stamping surfaces.

EP-B-0 436 058 discloses an extrusion and calendaring method forproducing a plastic plate, in particular for lining concrete containerscomprising anchor elements, which consists of planiform wings which arearranged in an approximately V-shaped manner with respect to each otherthereby including an angle and being offset with respect to theirwidths. For this purpose, a roll comprises recesses each having at leasttwo partial recesses for wing elements, said recesses spreading from asurface area of the roll into the interior of the roll and said wingelements extending into the roll in a non-undercut manner. Duringproduction, the melt fills the recesses, is cooled and pulled out orextracted from the mold.

DE-A-31 08 972 describes a method in which individual injection-moldedknobs are connected with a smooth plastic plate by means of welding.

EP-A-0 294 507 discloses a method and a device for producing knobbedplates, wherein the plates are continuously extruded, wherein the plateblank is passed between two rolls, at least one thereof being a profiledroll, wherein on the one side of the profiled roll the knobs are formedof the material of the plate blank and wherein the formed knobs arepassed in a substantially translatory movement through a (cutting) toolforming an undercut.

FR-A-1 102 294 describes a method in which plastic plates are producedby extrusion, wherein during extrusion and caused by the extrusionprocess, anchor strips, which can also be undercut, are formed on aplate surface over the entire length of the plate.

U.S. Pat. No. 2,816,323 discloses a plastic plate comprising continuouslongitudinal rails having a T-profile.

DE-A-29 34 799 discloses a concrete protection plate comprising anchorribs which extend parallel with respect to each other and comprisechannels.

EP-A-0 960 710 discloses a continuous extrusion process for continuouslyand nondestructively producing plastic plates comprising anchor knobs,wherein a roll comprises different shaping strips; the anchors or websto be formed are incorporated in the side walls of the shaping strips,and the shaping strips can be lifted by hydraulic or pneumatic cylindersin order to release the resulting anchor plate.

DE-A-25 29 631 describes a shaping means for forming ribs, swellings,journals or upright necks on a shapeable material, which are deformedunder pressure.

The non-continuous processes are, i.a., disadvantageous in that aplurality of working steps in a plurality of devices are necessary forproducing the anchor plate. This entails an increase in costs and timeas compared to continuous extrusion processes. In addition, thesubsequent deformation of the anchors or the subsequent attachment ofthe anchors leads to intersections and/or changes in the material orstructure, which has a negative effect on the quality of the plasticplates.

In continuous processes, in which undercut anchor shapes are formed inone plane only, the anchor is extracted or removed from the mold afterthe melt has cooled. In turn, this leads to the disadvantage thatplastic plates that are encased with concrete and produced in the mannerdescribed above can be pushed or pulled out of the concrete withrelatively low force.

Moreover, continuous processes in which longitudinal webs are producedin the production direction are disadvantageous in that bad resultsconcerning durability etc. have been achieved as compared to punctiformattachments that can be stressed equally in each direction, since inbuildings that have to be lined it should be possible to stress theplate in each direction equally.

In strips that open or close by means of hydraulic or pneumaticcylinders, a continuous production guaranteeing at the same time a highquality is difficult due to the great number of cylinders and thecomplicated and costly control thereof. Moreover, there is the risk thatescaping pressurized air has locally a negative effect on the propertiesof the plastic plate.

Furthermore, in the processes described above the working widths areoften limited and there is no possibility to continuously produceindividual anchors having undercut shapes, such as, e.g., upside-downtruncated cones or web-shaped anchors, transversely with respect to theproduction direction. It is not possible to produce such shapes with aclosed mold or shaping strip. Moreover, the known processes influencethe properties of the anchor plate i.a. by cold forming, deformation atthe anchor during production, or by welding processes with multi-stepproduction.

It is therefore an object of the present invention to provide a deviceand method for variably and continuously producing plastic plates and/orfilms with anchors on one or two sides, wherein the shapes are undercutin one or more planes, such as, e.g. upside-down truncated cones orweb-shaped anchors, transversely with respect to the productiondirection. It is a further object of the present invention to provide adevice and a method for continuously producing multi-layer plates and/orplates containing additives and having anchors on one or two sides.Moreover, it is intended to overcome the further disadvantages of theprior art.

These objects are achieved with the features of the claims. Theinvention starts out from the basic idea to form the anchors of aplastic plate by means of recesses or nests having the shape of theanchor and being formed in shaping strips, wherein along each of itsside wall(s) a shaping strip comprises a part of one or more anchornests and wherein a complete anchor nest is formed by bringing twoshaping strips together. Moreover, on a circulating device, whichcomprises at least a straight section and a curved section, the shapingstrips are arranged in such a manner that the shaping strips contacteach other in the straight section and form complete nests or recessesfor forming the lugs, wherein the shaping strips open with respect toeach other in the curved section and thus release the resulting anchorsor lugs.

The device of the present invention and the method of the presentinvention allow a continuous production of plastic anchor plates in oneworking step and with increased extrusion speed. The shaping strips usedfor forming the anchors are safely closed during filling, and theresulting anchors can be ejected or released without a specific deviceand without force or with only a slight force.

By means of the device of the present invention and the method of thepresent invention it is possible to form, in particular, non-positiveanchor shapes, e.g. upside-down truncated cones or truncated pyramids orweb profiles arranged transversely with respect to the productiondirection.

Moreover, it is possible to form anchors or web profiles withharmonically realized cross-sectional transitions in the area of anchorand plate in order to thus guarantee an optimum carrying or loadingcapacity.

A preferred device of the present invention comprises a circulatingdevice which has a chain or belt drive and to which shaping strips arearranged preferably uniformly. In their edge regions or side walls, theshaping strips comprise recesses having the shape of a portion of arecess for forming the lugs so that two shaping strips that contact eachother comprise at least one complete recess for forming at least onelug. The shaping strips are arranged on the circulating device or thechain or belt drive in such a manner that the shaping strips fullycontact each other in the straight sections of the circulating deviceand thus form completely closed recesses for forming the lugs oranchors. In a preferred embodiment of the invention, the shaping stripsare arranged on the circulating device in a regularly spaced-apartmanner.

In a further preferred embodiment of the invention, the chain or beltdrive of the circulating device is stressed such that the shaping stripsfully contact each other in the straight sections of the drive.Hydraulic cylinders, spindle lifting gears and/or pneumatic cylindersare preferably used for permanently generating and adjusting a desiredstate of stress.

For producing the anchor plates, the device preferably comprises a rollwhich is arranged in such a manner with respect to the circulatingdevice that a gap is formed between circulating device and roll. Themolds or nests are filled and the plate is formed in the gap between theshaping strips of the straight section of the circulating device and theguide roll, which can accordingly be positioned in a non-positive orforce-fitted manner.

In a preferred embodiment of the present invention, the melt is shapedby extruding it through a slotted nozzle and subsequently passed throughthe roll gap.

In a particularly preferred embodiment, the temperature of the shapingstrips is controlled in such a manner that it is possible to achieve anoptimum formation of the anchor plate, an optimum cooling process of theanchor plate and/or optimum properties of the plate, e.g. a particularlylow-stress plate.

After cooling the plate and the molds via the shaping strips along thestraight section of the circulating device, the shaping strips open andthus also the molds on the curved section of the circulating device, sothat the plate and the anchor(s) are released.

In a further preferred embodiment of the present invention, the curvedsection of the circulating device is circular, wherein the chain or beltdrive has a reference diameter D₁ and the shaping strips along thecurved section have an average diameter D_(m), wherein the diameters arerelated in such a manner that after the end of the straight section andat the beginning of the semicircular section the distance between theshaping strips increases so much due to geometry that the lugs can beejected. In addition to the anchor dimensions and the above-mentioneddiameters, the geometrical conditions during ejection are alsoinfluenced by the widths of the shaping strips. For example, with aratio D₁:D_(m)=1:2 and with a shaping strip width of, e.g., 50 mm, thefreed distance between the shaping strips in the circular section isalso 50 mm. In a further preferred embodiment, the gap between theshaping strips in the curved section opens due to a correspondingnecessary diameter ratio of chain part circle and mold part circle andthus allows a removal of the anchors without force.

The circulating device preferably comprises two straight and twosemicircular sections so that, after having been filled with melt in thefirst straight section and opened in the first circular section, theshaping strips again close along a subsequent second straight portion.In a further subsequent second circular section, the shaping strips openin order to close again firmly in the transition to the first straightsection and be filled again. This sequence allows a continuousproduction.

In a preferred embodiment of the present invention, the shaping stripsare brought to a desired temperature while moving along the secondstraight section and the second circular section.

By changing the spacing between the chain and shaping strips, thedistances between the anchors in the longitudinal direction can beselected. By changing the shaping strips, both the transverse distancesand also the shapes of the anchors can be changed.

If no specific ratio between reference diameter D₁ of the chain or beltdrive and shaping strip diameter D_(m) is selected in case of specialanchor dimensions and shaping strip widths, so that at the end of thestraight section and at the beginning of the semicircular section anejection without force is not possible, the distance can also be changedby specially formed wedge-shaped shaping strips in such a manner that anejection without force is possible.

In the following, the invention will be discussed on the basis ofpreferred embodiments and the drawings in which

FIG. 1 is a side view of a preferred device of the present invention;

FIG. 2 is a side view of a detail of a preferred device of the presentinvention;

FIG. 3 is a side view of a further preferred embodiment of the presentinvention;

FIG. 4 is a side view of a further preferred embodiment of the presentinvention;

FIG. 5 is a side view of a detail of a further preferred device of thepresent invention; and

FIG. 6 is a side view of a preferred embodiment of the present inventioncomprising an application means.

FIG. 1 is a side view of a preferred embodiment of the present inventioncomprising a circulating device 1 having two straight sections 1 a andtwo circular sections 1 b. The circulating device 1 is preferablyconfigured as a chain drive comprising a chain 2, chain wheels 3 as wellas an inner support 4. Moreover, shaping strips 5 are arranged at thecirculating device 1. On their side walls, the shaping strips 5 compriseat least one recess or cavity or nest 6. In a preferred embodiment ofthe present invention, each chain member of the chain 2 comprises asupport element 7 to which a shaping strip 5 is attached. The shapingstrips 5 are preferably arranged at a uniform and constant distance withrespect to each other along the circulating device 1. The preferredgeometrical configuration of the shaping strips 5 will be explained inmore detail below with reference to FIG. 2.

Moreover, the device comprises a roll or guide roll 8 which is arrangedin such a manner with respect to the circulating device 1 that a definedgap 9 is formed between the roll 8 and the shaping strips 5 arranged atthe circulating device 1.

Through a flat nozzle 10, the plastic melt 11 is introduced between theroll 8 and the circulating device 1. In the gap 9, the plastic or anchorplate 12 is formed and anchor or lug molds 13, which are formed by twoshaping strips 5 that contact each other closely, are filled. In aparticularly preferred embodiment, the position of the guide roll 8 canbe changed for adjusting individual process parameters.

In a particularly preferred embodiment, the shaping strips can bebrought to a desired temperature. Thus, it is possible to control thecooling process of the anchor plate 12, which was formed after passingthe gap 9, along the straight section 1 a of the circulating device 1.In a further preferred embodiment, the support devices 7 are configuredsuch that they bring the shaping strips 5 to a desired temperature. Infurther preferred embodiments, the shaping strips 5 as such can bebrought to a desired temperature. In a preferred embodiment, also theguide roll 8 can be brought to a desired temperature for an optimumadjustment of the production parameters.

When the shaping strips 5 pass from the straight section 1 a into thecircular section 1 b, the shaping strips 5 or recesses 6 open withrespect to each other and release the anchors 14 formed on the anchorplate 12.

In a particularly preferred embodiment, the formed anchor plate 12 issupplied to the further process via a roll 15.

By adjusting and controlling the temperature at the different processstages and during the individual process stages, the properties of theanchor plate can be adjusted and optimized. The control of thetemperature or temperature curve (variation) is suitable, e.g., forachieving particularly low-stress plates.

FIG. 2 shows a detail of the embodiment of FIG. 1 of the presentinvention. It shows three chain members of the chain 2 of thecirculating device 1, support elements 7 arranged thereon, and shapingstrips 5 as well as the formed anchor plate 12 comprising anchors 14 atthe transition from the straight section 1 a into the semicircularsection 1 b.

It is clearly evident that the shaping strips 5 contact each othersealingly and in a force-fitted manner at the straight section 1 a.Recesses 6 of the shaping strips 5 are formed in such a manner that theyeach represent a portion of the negative anchor mold and correspond witha corresponding recess 6 of the neighboring shaping strip 5 in such amanner that, when the shaping strips 5 contact each other along thestraight section 1 a, the recesses 6 together form a recess 13 havingthe desired negative shape of the anchors 14. The recesses or nests 6are arranged in a corresponding manner on both side walls of the shapingstrips 5 and preferably form one half of the negative anchor mold 13.

In a further preferred embodiment, the side walls of the shaping strips5 comprise recesses 6 that have different shapes and form the negativeanchor mold 13 when the shaping strips contact each other.

When passing from the straight section 1 a into the semicircular section1 b, the shaping strips 5 and thus also the recesses 6 open with respectto each other, so that the anchors 14 are ejected or released. Theejection takes place without force, i.e. no additional ejection forcesare acting on the anchor 14.

In order to guarantee a full and force-fitted contact between theindividual shaping strips along the straight section la, in a preferredembodiment of the present invention the device comprises at least onetensioning device 16 as shown in FIG. 3. Said tensioning devices arepreferably hydraulic cylinders, spindle lifting gears and/or pneumaticcylinders. The tensioning device particularly preferably stresses thechain 2, the band or the belt, so that the desired contact between theshaping strips is achieved. In further preferred embodiments of thepresent invention, there is a form-fitted contact between the shapingstrips.

In a further preferred embodiment of the present invention, thecirculating device 1 comprises a device 17 along the straight section 1a opposite to the roll 8. The device 17 preferably comprises a pluralityof rolls that can be brought to a desired temperature and by means ofwhich the shaping strips are brought to a desired temperature. In apreferred embodiment of the present invention, the device 17 brings theshaping strips to a temperature of about 80° C.

In a particularly preferred embodiment of the present invention, theouter distance between opposing shaping strips 5 is about 94.5 cm alongthe straight sections 1 a, and the corresponding average distancebetween the chain members of the chain 2 is about 65 cm. The referencediameter of the chain drive is about 66.8 cm. The rolls 8 and 15 havediameters of about 80 cm and 40 cm, respectively.

The ratio between the reference diameter D₁ of the chain or belt driveand the average shaping strip diameter D_(m) is such that when passingfrom the straight section 1 a into the curved section 1 b, the shapingstrips open so much with respect to each other that no force isnecessary for the ejection. The optimum geometry depends on the furthergeometric values such height and width of the anchor, width of theshaping strips, etc.

The device of the present invention and the method of the presentinvention make it possible to continuously produce plastic or anchorplates comprising lugs or anchors having complicated geometrical shapeswith overlaps in a plurality of planes. In view of the anchor plate 12,preferred anchor shapes are, e.g., upside-down truncated cones orpyramid cones as well as web profiles extending transversely withrespect to the production direction, e.g. T-profiles. Depending on theapplication and requirements, different further geometric anchor shapescan be produced.

In order to vary the anchor shape and the distances between the anchorsin the longitudinal and/or transverse directions, in a preferredembodiment of the present invention the reference distance between thechain strips and/or shaping strips can be varied or changed and/or theshaping strips are exchangeable.

By means of further preferred devices of the present invention and/ormethods of the present invention, one- or multi-layered platescomprising anchors on one or two sides and/or different shapes can beproduced. Preferred embodiments of the present invention allow theproduction of one- and/or multi-layered anchor plates or sheets whichcomprise incorporated knitted materials, non-woven materials, metallicsheets or foils as well as glass fibers and/or polyester fibers. Suchembodiments allow the use in specific fields of application.

FIG. 4 shows a further preferred embodiment of the present invention. Inaddition to the flat nozzle 10, the device comprises a further flatnozzle 18 as well as a smoothing system consisting of rolls 19 and 20.Moreover, the roll 8 is preferably pivotable so that it can be broughtin at least two positions 8A, 8B. The described device is suitable forvariably producing plates having different geometries and properties.

In a preferred embodiment of the device, a plastic melt 18 is introducedthrough the flat nozzle 18 into the smoothing system between the rolls19 and 20. The resulting plastic plate 21 is supplied to the roll 8,which is in position 8B, and supplied to the further process via thetransport and/or cooling device 22 and the roll 15. In this preferredembodiment of the present invention, smooth plates without anchors canbe produced. Also plates with reinforcements and/or additives can beproduced in this manner.

In a further preferred embodiment of the embodiment shown in FIG. 4, theroll 8 is in position 8A. The melt supplied through the nozzle 18 issupplied to the roll 8 and the device 1 via rolls 19 and 20. In thisway, anchor plates 23 with greater thickness, additives and/orreinforcements, e.g. films or metal foils, can be produced. The plates23 are preferably about 3 mm to 12 mm thick.

As already discussed with respect to FIGS. 1 to 3, thinner anchor platesare produced by supplying the melt 11 through the nozzle 10 into the gap9. The thickness of the anchor plates 12 that were produced in thismanner is preferably about 1 mm to 3 mm.

In a further preferred embodiment, the roll 8 is in position 8A, whereinboth the nozzle 18 and also the nozzle 10 supply melt. Via the roll 8,the resulting plates are brought together in the gap 11 and connectedwith each other.

In a further preferred embodiment of the present invention, the plate issupplied with a film or any other flat material, e.g., a fabric,non-woven material, knitted material and/or a plastic film or metalfoil, and connected therewith.

In a further preferred embodiment of the present invention, the rolls 8,19, 20 and/or 15 have one or more profiles which are transferred to themelt web and/or plates or films 12, 21 and/or 23. In a further preferredembodiment, two plastic plates comprising anchors that were produced bymeans of a circulating device 1 and a roll 8 are connected with eachother.

FIG. 5 shows a particularly preferred embodiment of the circulatingdevice I and shaping strips 5 and the support devices 7. If there is nospecific ratio between the reference diameter D₁ and the average shapingstrip diameter D_(m), so that an ejection without force is not possibleat the end of the straight section 1 a and at the beginning of thecurved section 1 b, specifically configured wedge-shaped shaping strips5 can make it possible to open the shaping strips 5 and the recesses 13for ejecting the lugs. As shown in FIG. 5, in a particularly preferredembodiment the shaping strips 5 substantially consist of two parts andrest on a wedge-shaped support device 7. Along a straight section 1 a,the support devices are inserted in the shaping strips to the greatestpossible extent, and the shaping strip parts are thus spread in such amanner that the shaping strips firmly contact each other and formrecesses 13 for forming the anchor 14, as described above. Along thecurved sections 1 b, the wedge-shaped support devices 7 are at leastpartially pulled out of the shaping strips. The shaping strip parts movetowards each other, preferably in contact with the support device 7.Thus, the distance between the shaping strips 5 is reduced so that theshaping strips 5 and recesses 13 open with respect to each other forejecting the lugs. In a further preferred embodiment, the shaping strips5 and the support devices 7 move in the area of the curved section ondifferently curved planes.

FIG. 6 shows a further preferred embodiment of the present invention,wherein said embodiment is arranged with respect to the plastic powderapplication device 27 in such a manner that the plastic powder isapplied to the plate 12, 21, 23 as shortly as possible or directly afterejection, so that the selfenergy or intrinsic energy of the plate (heat)can be used for adhering the powder to the plate. Due to the adhesion ofthe powder or granules, a nonskid surface of the plate 12, 21, 23 isachieved. The utilization of the intrinsic energy of the plate allows aparticularly economical production. In a further preferred embodiment,the adhesion of the powder to the plate is supported by the use ofradiators. Particularly preferably, the plastic powder applicationdevice 27 is used in the area of the deflection roll 15.

In a further preferred embodiment of the present invention, the deviceis used in combination with further devices such as one or more edgecutting device(s), thickness measurement device(s), cross cutting disksaw(s) and/or a traction system. After production, the anchor plates 12can thus be further processed, cut in size, manufactured into plates orcoiled and/or subjected to a quality control.

The device according to the present invention is preferably arrangedhorizontally, vertically or in a specific angle, and the melt can besupplied from the top, bottom, side or in a specific angle. Acombination of the described embodiments leads to further preferreddevices and methods of the present invention.

The device of the present invention and the method of the presentinvention enable a continuous production of anchor plates comprising, inparticular, force-fitted and complicated anchor shapes that can berealized quickly and with a few working steps.

1. A device for producing plastic plates (12, 21, 23) comprising lugs(14) on at least one side, wherein the lugs (14) are formed integrallywith said side, said device comprising a circulating device (1) and aroll (8) that can be adjusted thereon, wherein the circulating device(1) comprises at least one straight section (1a) and at least one curvedsection (1b), wherein (a) shaping strips (5) are arranged on thecirculating device (1), (b) the shaping strips (5), which comprise oneach of their neighboring side walls a corresponding part (6) of atleast one recess or one nest (13) for forming the lugs (14), contacteach other in the straight section (1 a) of the circulating device (1)in such a manner that corresponding recesses (6) of neighboring shapingstrips (5) form a closed recess or a nest (13), and (c) the shapingstrips (5) open in the curved section (1 b) for ejecting the lugs (14).2. The device according to claim 1, wherein a plastic melt is shaped byextrusion through a slotted nozzle (10) and subsequently passed throughat least one roll gap (9) between the circulating device (1) and theroll (8).
 3. The device according to claim 1, wherein the circulatingdevice (1) comprises a chain (2), a band or a belt.
 4. The deviceaccording to claim 1, wherein the curved section (1 b) is circular. 5.The device according to claim 1, wherein the temperature of the shapingstrips (5) and/or the adjusted roll (8) is controllable or adjustable.6. The device according to claim 1, wherein the shaping strips (5)comprise one or a plurality of individual recesses (6) along theirwidths.
 7. The device according to claim 1, wherein, with respect to theplastic plate, the recesses (13) have the shape of upside-down truncatedcones.
 8. The device according to claim 1, wherein the shaping strips(5) comprise one or a plurality of web- and/or strip-shaped recesses(6).
 9. The device according to claim 1, wherein the shaping strips (5)are variable and/or exchangeable.
 10. The device according to claim 1,wherein the shaping strips (5) are made of dimensionally stablematerials such as steel, aluminum and/or the like.
 11. The deviceaccording to claim 1, wherein the shaping strips (5) are arranged alongthe circulating device (1) in regular intervals.
 12. The deviceaccording to claim 3, wherein the stress of the circulating device (1)and/or the chain (2), band or belt can be generated and/or adjusted bymeans of a tensioning device (16).
 13. The device according to claim 12,wherein the tensioning device comprises at least a hydraulic cylinder, aspindle lifting gear and/or a pneumatic cylinder.
 14. The deviceaccording to claim 12, wherein the stress causes the shaping strips (5)to contact each other in a force-fitted manner along the straightsection (1 a).
 15. The device according to claim 1,The device accordingto any one of the preceding claims, wherein, due to a correspondingratio between reference diameter (D₁) of the circulating device (1) andaverage diameter (D_(m) ) of the shaping strips (5), the shaping strips(5) which contact each other in the straight section (1 a) open in sucha manner with respect to each other when passing from the straightsection (1 a) into the curved section (1 b) that they release the lugs(14) formed in the recesses (13).
 16. The device according to claim 1,wherein the shaping strips (5) which contact each other in the straightsection (1 a) rest on a wedge-shaped support device (7) so that theyopen in such a manner with respect to each other when passing from thestraight section (1 a) into the curved section (1 b) that they releasethe lugs (14) formed in the recesses (13).
 17. The device according toclaim 1, wherein the plate is made of polyethylene, polypropylene,polyvinylchloride (PVC), polyvinylidenefluoride (PVDF), ethylenetetrafluoroethylene (ETFE), special types of said materials or acombination thereof.
 18. The device according to claim 1, wherein asecond film web or plastic plate (23) is supplied to the roll (8) andthe circulating device (1) and connected with the plastic plate (12) toform a homogeneous plate.
 19. The device according to claim 1, whereinthe roll (8) is pivotable in at least two positions (8A, 8B).
 20. Thedevice according to claim 19, wherein a nozzle (18) as well as asmoothing system consisting of rolls (19, 20) for producing films and/orplastic plates (21, 23) are arranged in such a manner that the plasticplates can be supplied to the roll (8) in both positions (8A, 8B). 21.The device according to claim 20, wherein at least a second circulatingdevice (1) according to said claim 20 is arranged in such a manner withrespect to the first device that the resulting plastic web comprisesanchors on both sides.
 22. The device according to claim 1, wherein thedevice comprises means (24, 25, 26) for supplying additives andconnecting them with the plastic plate (12, 21, 23).
 23. The deviceaccording to claim 22, wherein the additives are flat materials such asa fabric, non-woven material, knitted material, metal foil and/orplastic film.
 24. The device according to claim 23, wherein theadditives are drawn in by a roll (8, 19, 20) and connected with the meltof the plastic plate (12, 21, 23).
 25. The device according to claim 22,wherein the additives and/or flat materials are positioned on and/orbetween the plates (12, 21, 23).
 26. The device according to claim 20,wherein at least one of the rolls (8, 15, 19, 20) has a profile which istransferred to at least one of the plastic plates (12, 21, 23).
 27. Thedevice according to claim 1, wherein the device can be arrangedhorizontally, vertically or in a specific angle and wherein the melt canbe supplied from the top, bottom, side or in a specific angle.
 28. Thedevice according to claim 1, wherein the device is arranged in such amanner with respect to a plastic powder application device (27) thatdirectly after formation of the plastic plate (12, 21, 23) its intrinsicenergy can be used for achieving an adhesion of the powder to the plate(12, 21, 23).
 29. A method for producing plastic plates (12, 21, 23)which comprise lugs (14) that are integrally formed therewith on atleast one side by using a device according claim
 1. 30. The methodaccording to claim 29, wherein a flat molten plastic web is pressedthrough the gap (9) between the straight section (1 a) of thecirculating device (1) and the roll (8) adjusted thereon.
 31. A methodfor producing plastic plates (12) which comprise lugs (14) that areintegrally formed therewith on at least one side, characterized in thatmelt is shaped by extrusion through a slotted nozzle (10) andsubsequently passed through at least one roll gap (9) between acirculating device (1) and a roll (8) adjusted thereon, wherein thecirculating device (1) comprises at least one straight section (1 a) andat least one curved section (1 b), wherein neighboring shaping strips(5), which comprise along their side walls a corresponding part (6) ofat least one recess or nest (13) for forming the lugs (14), contact eachother in a closed state at the straight section (1 a) of the circulatingdevice (1) in such a manner that corresponding recesses (6) ofneighboring shaping strips (5) form a closed recess or a nest (13),wherein the plastic plate (12) and the lugs (14) are formed in the gap(9) and in the recesses (13), respectively, and wherein in the curvedsection (1 b) the neighboring shaping strips (5) open in such a mannerwith respect to each other that they release the lugs (14) formed in therecesses (13).
 32. The method according to claim 31, wherein, due to acorresponding ratio between reference diameter (D₁) of the circulatingdevice (1) and average diameter (D_(m)) of the shaping strips (5), theshaping strips (5) which contact each other in the straight section (1a) open in such a manner with respect to each other when passing fromthe straight section (1 a) into the curved section (1 b) that theyrelease the lugs (14) formed in the recesses (13).
 33. A plastic plate(12, 21, 23) comprising lugs (14) and being produced in accordance withthe method according to claim
 31. 34. A plastic plate (12, 21, 23)comprising lugs (14) and being produced by means of a device accordingto claim 1.